Master Airscrew MA4100 Razor Plane

Is it doing the job? YES. Chassis is plastic (3D printed?) with 2x adjustment screws for blade depth and 1x screw for setting position. It works well. As a craft use on balsa and lighter basswood it is doing the job. The anchoring/set screw and plastic plate is not very grippy on the blade and I am concerned about over-tightening. Adjusting screws offer basic adjustment but there are no scales as to adjustment made (count how many quarter turns of the screw you make). At the price it is good value and I am assuming it may need replacing and so treating as a throw-away - which at the price is acceptable. If it lasts longer than my project, then I’m happy to be proved wrong!

I just want to reiterate what Edward T. Kerns said about the blue plastic blade retainer; but I want to emphasize that the retainer goes ON TOP OF the blade, NOT UNDER it. While it might appear to be a simple plastic blade guide that the blade screws on to, it's not. Nowhere in the brief instructions that came with the product or even on Master Airscrew's website does it mention this. While it may seem common sense, the simple line drawing doesn't help much to make this obvious (neither does the terribly dark and featureless product photo). Hope this helps.

The razor planer is indispensable for building balsa model airplanes. It's really the only practical way to shape the leading edges of wings and other surfaces. This particular model is exactly like one my father had several years ago. It's a bit tricky at first, because you have to adjust the blade depth to take off the right amount of material. Start shallow, and increase the depth gradually until you achieve the desired result. The adjustment is easy, but you have to eyeball the blade to measure the depth. I don't know of any other products that do what this does. Fortunately, this one does a fairly good job.

Actually it works quite well short time I tried it. Time will tell. I thought it would be made of light metal but it is plastic. Blade adjustment is a little tricky and won't allow too much blade surface to breach the blade slot. This may be good as I use it more.

First, although the picture looks like it's made of metal, it's not; it's made of plastic. Therefore, by its very nature, accuracy will be lost to any applied force. Consider this before you buy. Next, the blade-adjustment screws are "bottomed out" and do not come in contact with the blade. If you try forcing these screws to make contact, the piece will surely crack. Tiny washers or some other kind of spacers have been suggested by AJ. I haven't yet looked at it closely enough to consider the possibilities of shortening the screws or of drilling deeper; nor if in the latter case, threads would be troublesome.

Making leading edges for my airplanes are far easier now, and they come out better than before.

I tried this plane one time and then gave up on it. I think it probably works OK, but it wasn't as easy as just setting the blade and planing away. I'm used to full size planes for larger wood pieces and I assumed this one worked similarly. I fiddled with it for about 15 minutes, but I couldn't get the plane depth set to a precise level, and after a few passes, the blade would slip. There were no instructions that I saw in the package that may have helped me set the item up. I'll probably try it again sometime when I'm desperate and have to get it to work.

Carves out my parts perfectly. Its just the right size to use in my hobby.